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-   -   My exhaust is too loud - how to make quieter? (http://www.clubcobra.com/forums/all-cobra-talk/112754-my-exhaust-too-loud-how-make-quieter.html)

garry viohl 09-29-2011 09:21 PM
My exhaust is too loud - how to make quieter?
 
I know, most people want louder. But I think the car is too loud around town.

482 cid FE
cam is 240/246 110 lobe sep
18 inch long glasspacks (with packing) with louvers pointed with air flow
3 inch pipes

I have installed dynatech vortex insert cones at inlet of muffler
they claim 2-3 decibel reduction

I bought 2 more and installed them in the tailpipe, cant hear much difference

I thought of installing heavy steel wool in front of cones, front and back

Any ideas? Thanks.

menace1 09-29-2011 10:34 PM
Your kidding right? Be loud and proud I say...Otherwise install a undercarriage exhaust system or one of those Tesla motors may do the trick. ;)

Jeff Frigo 09-29-2011 11:26 PM
http://images.grainger.com/B343_23/i...4T147_AS01.JPG

tkb289 09-30-2011 12:42 AM
Garry,

I do not have any direct personal experience or affiliation, but understand that Stainless Specialties makes custom mufflers with a ceramic acoustic liner that according to their web site has a 'subdued sound with great flow'.

Here is a link to their web site if you are interested ...

Stainless Steel exhaust components•


- Tim

mdross1 09-30-2011 04:02 AM
Quote:
Originally Posted by tkb289 (Post 1154044)
Garry,

I do not have any direct personal experience or affiliation, but understand that Stainless Specialties makes custom mufflers with a ceramic acoustic liner that according to their web site has a 'subdued sound with great flow'.

Here is a link to their web site if you are interested ...

Stainless Steel exhaust components•


- Tim
My choice was belly exhaust using custom mufflers from Stainless Specialties love the sound and the performance out of 460ci.

SunDude 09-30-2011 05:11 AM
Quote:
Originally Posted by Jeff Frigo (Post 1154039)
+1

This is the correct answer IMO.

mickmate 09-30-2011 05:16 AM
Make them 2-1/2" x 24" with the louvres facing the motor.
Classic Chambered Exhaust Inc. - Products The 2524's

patrickt 09-30-2011 05:40 AM
Gary, I think the absolute truth of the matter is you're going to have to get new pipes made. I have the Stainless Specialties "quieter pipes" and they do pretty well. Short of new pipes, everything else is a just a gimmick.

ACademic 09-30-2011 06:45 AM
Quote:
Originally Posted by mickmate (Post 1154058)
Make them 2-1/2" x 24" with the louvres facing the motor.
Classic Chambered Exhaust Inc. - Products The 2524's
Mickmate, you have a lot of experience with the Classic Chambered. I'm running the 3" (louvers facing the motor) on a 22" case and they sound great at idle but sound "less Cobra-like" on moderate/hard acceleration. In your opinion does your suggestion above get the overall sound back to that classic Cobra gurgle throughout the rpm range? It's really hard finding well-prepared sound clips on some of these options.

CHRIS DAMSCH 09-30-2011 07:12 AM
Add twin turbo's. That should quiet it down.
Or put a cam in with a 114 lobe separation and lower your compression a little.

bobcowan 09-30-2011 08:23 AM
A while back I welded in a set of mufflers from Classic Chambered. They look good, and sound great. Definatly a reduction in noise levels. More importantly, the sound is a little deeper, without the harsh "blatt" of the stock FFR mufflers. Pretty inexpensive, too. Classic Chambered says they make more power, but I can't say one way or the other on that.

I wear earplugs for any trip more than 10-15 minutes. The exhaust note is fairly quiet. But wind and tire noise will wear you out; especially on a concrete roadway.

Jeff Frigo 09-30-2011 05:45 PM
Quote:
Originally Posted by patrickt (Post 1154061)
Gary, I think the absolute truth of the matter is you're going to have to get new pipes made. I have the Stainless Specialties "quieter pipes" and they do pretty well. Short of new pipes, everything else is a just a gimmick.
I have talked to guys in who race A Production cars (see below) in vintage races that swear that these work well with little to no loss in power.

Dynatech Accessories - Auger Style Muffler

http://www.dynatechheaders.com/graph...er_muffler.jpg

A-Production

AC Cobra (427cid)
1970-72 Chevrolet Corvette 350cid
1965-67 Chevrolet Corvette 427cid
1968-72 Chevrolet Corvette 427/454cid
DeTomaso Pantera 351cid
Ford Boss 429 429cid
Shelby GT-500 428cid

patrickt 09-30-2011 05:54 PM
Quote:
Originally Posted by Jeff Frigo (Post 1154132)
I have talked to guys in who race A Production cars (see below) in vintage races that swear that these work well with little to no loss in power.

Dynatech Accessories - Auger Style Muffler
I've heard that too. But there have also been threads on here where guys have tried them and said just the opposite. I also suspect that the psychological force of "believing they work," after you've gone to the trouble of buying and installing them, might also come in to play. I know I had been around more than one Cobra that just plain hurt my ears (from both outside the car, and inside) so I dealt with the issue when SS was fabbing the pipes. I really like their "quieter pipes" on my FE, but it's going to cost him a couple of bucks. On the other hand the auger inserts are only $15, so WTF, he might as well give it a shot I suppose.

Dwight 09-30-2011 06:55 PM
Classic mufflers
 
I replaced my 2 1/2" x 24" mufflers (louvers facing away from motor) with Classic 3" x 28" (louvers facing the motor). They are a lot quieter and still sound like a Cobra, deep rumble at idle.

Dwight

mickmate 09-30-2011 08:32 PM
I have tried the Stainless Specialties mufflers, Hedmans and keep coming back to the Classic Chambered. I have found even the 3" x 21" with louvres facing the tailpipes make it relatively easy to drive and still be able to hold a conversation with the passenger. As pointed out the wind and road noise starts to override exhaust noise at speed anyway. I like the tone of the Classics it's a deeper smoother sound with good throat but it sure makes that right pedal a volume control. This is Davids FE with the Classic 3" louvres facing back. See what I mean about wind noise!
Cobra in Maryland - YouTube

Jeff Frigo 09-30-2011 08:45 PM
Quote:
Originally Posted by patrickt (Post 1154134)
I've heard that too. But there have also been threads on here where guys have tried them and said just the opposite. I also suspect that the psychological force of "believing they work," after you've gone to the trouble of buying and installing them, might also come in to play. I know I had been around more than one Cobra that just plain hurt my ears (from both outside the car, and inside) so I dealt with the issue when SS was fabbing the pipes. I really like their "quieter pipes" on my FE, but it's going to cost him a couple of bucks. On the other hand the auger inserts are only $15, so WTF, he might as well give it a shot I suppose.
Patrickt:

I have not been able to find anybody on the forum that has tried them. I have searched. Do you think you could find that thread. I was planning on trying them this winter, but if they are NG, I would like to save my money. $15.00 is no biggy, but the rest of the process for existing ceramic coated pipes are.:CRY::CRY::CRY:

undy 10-01-2011 04:12 AM
I had the "auger" style mufflers on my ride and picked up 40 rwhp (and a small amount of noise) when I went to the Classic Chambered exhaust. There's just too much exhaust impingement with the spiral style...

Jeff Frigo 10-01-2011 05:09 AM
Quote:
Originally Posted by undy (Post 1154202)
I had the "auger" style mufflers on my ride and picked up 40 rwhp (and a small amount of noise) when I went to the Classic Chambered exhaust. There's just too much exhaust impingement with the spiral style...

What was the hp diff with the chambered? Pleases explain exhaust impingement.

Mdman352 10-01-2011 06:45 AM
This is with the Cobra Pak.

mdman352's Channel - YouTube

this is with whatever came with the Contemporary pipes.

mdman352's Channel - YouTube

Jeff Frigo 10-01-2011 07:37 AM
Quote:
Originally Posted by Mdman352 (Post 1154214)
This is with the Cobra Pak.

mdman352's Channel - YouTube

this is with whatever came with the Contemporary pipes.

mdman352's Channel - YouTube
Sounds the same, maybe a touch quieter with the first one.


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